Re: Re: Dolomitic limestone?

Linda:

I'm an old mining engineer.  I can still remember our Freshman Geology
classs where emphasis was placed on the difference.  Limestone reacts with
Hydracloric Acid (HCl), dolemite does not.  To tell the difference we would
place a drop of HCl on the rock to see if it did create a reaction.

I'll contact the head of the Geology Department at New Mexico State.  Maybe
they have made a notation change

Jim
James P. Reilly
jpreilly@zianet.com
----- Original Message -----
From: "Linda Mann" <lmann@volfirst.net>
To: "iris- talk" <iris@hort.net>
Sent: Sunday, April 04, 2004 2:13 PM
Subject: [iris] Re: Dolomitic limestone?


> Jim - in this area, we have both limestone (or calcitic limestone) and
> dolomitic limestone.   From what I found on the web, dolomitic limestone
> has a Ca:Mg ratio in the range 1.5 to 1.7.  In other words, dolomitic
> limestone is limestone in which there is more calcite (calcium
> carbonate) than dolomite (calcium magnesium carbonate).
>
> The process of 'dolomitization' is the replacement of Ca with Mg in
> calcitic limestone.  So I guess you could have calcitic dolomite too <g>
>
> The mineral dolomite is present in dolomitic limestone rock, dolomitic
> marble, and as veins in other rock types.  Dolostone is another name for
> rock that is primarily composed of the mineral dolomite.
>
> I'm not a geologist, but 'dolomitic' seems to be a perfectly good
> adjective - the phrase "dolomitic limestone" is widely used by USGS and
> in the soil sciences.
>
> <I'm starting to see the expression "Dolomitic Limestone"  in Iris
> publications.  As most people know, Limestone and Dolomite are two
> different rocks.  Dolomite is Dolomite, not Dolomitic Limestone.   Jim
> Reilly las Cruces, New Mexico>
>
> --
> Linda Mann east Tennessee USA zone 7/8
> East Tennessee Iris Society <http://www.korrnet.org/etis>
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